In contrast to mirror symmetry, the 3d \({\cal N}=4\)  avatar of the Seiberg-like duality maps a Coulomb branch to a
Coulomb branch across the duality and a Higgs branch to a Higgs branch.
This duality has not been studied in much detail, partly because
very few examples are known in the literature. One can attempt to modify the Elitzur-Giveon-Kutasov brane
system [1]} such that it preserves eight supercharges, as was done in [2]}, and try to read off an IR
duality. However, as is now well-known, the naive dualities read off from the set-up are generically incorrect,
and there is no obvious way to correct them from the brane picture. The simplest example of such a naive duality involves a \(U(N)\) 
SQCD with \(N_f\)  fundamental flavors and a \(U(N_f-N_c)\)  SQCD with the same number of flavors. The
duality demonstrably fails for generic \(N\)  and \(N_f\) . In the special case of \(N_f=2N-1\) , a modified version of the
duality can be shown to hold [3]}. In this case, the dual involves a \(U(N-1)\)  gauge theory with \(N_f=2N-1\)  and
a decoupled free twisted hypermultiplet. The \(U(N)\)  theory with \(N_f=2N-1\)  is an ugly theory in the Gaiotto -Witten
sense [4]} for which the IR SCFT is expected to factorize into a free sector and an interacting SCFT.
In the dual description, this interacting SCFT can be identified as the IR SCFT of the \(U(N-1)\)  gauge theory
with \(N_f=2N-1\)  fundamental flavors, which is a good theory in the Gaiotto -Witten sense.
Similar dualities were also proposed for the bad theories with \(N_f < 2N-1\)  [5]}, where the putative dual should be understood as the
low energy effective field theory associated with a certain singular locus on the moduli space of the original theory [6]}.
